Checking the wiring and component

Check connector A for the seat heating module (SHM). Check for contact resistance. Check for oxidation. Check for loose connections.

Check that the seat heating module (SHM) is connected to power supply and ground.

Measure the voltage at connector A between terminals #1 and #4.

Check LIN bus 2 by taking a reading between connector A for seat heating module (SHM) terminal #2 and the connector for climate control module (CCM) terminal A#7 (#31). Check for an open-circuit.

Try replacing the seat heating module (SHM) if no fault is found.

Remedy as necessary.

Other information: 

• See Connecting the breakout box
• See Signal specification
• See Climate control, location of components
• See Dashboard environment panel (including climate control module (CCM)), replacing
• See Seat heating module (SHM), replacing
• See Checking wiring and terminals

Fig 2: Identifying Left Seat Heating Module (SHM)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to Verification